At present, the gas sensor market maintains a vigorous development trend, and more application demands have emerged.
Carbon monoxide sensors are among the early-applied types of gas sensors. Since carbon monoxide is a flammable and explosive gas, excessive inhalation of it by the human body will cause hemoglobin to lose its oxygen-carrying capacity, leading to suffocation and even death in severe cases. Therefore, experts have never stopped researching carbon monoxide sensors, which has given rise to various types of carbon monoxide sensors based on different principles. Each type of sensor has its own advantages, disadvantages, and suitable application scenarios.
According to their reaction principles, carbon monoxide sensors are mainly divided into the following categories, each with corresponding pros and cons:
Semiconductor Principle
Advantages: Low cost and excellent performance.
Disadvantages: High power consumption, not suitable for battery-powered applications; easily affected by temperature, humidity, air flow, etc.; poor anti-interference ability and high false alarm rate.
Catalytic Combustion Principle
Advantages: Accurate measurement, fast response, and long service life.
Disadvantages: No selectivity within the range of flammable gases; operates with open flames, posing a risk of ignition and explosion; most organic vapors of elements can cause poisoning to the sensor.
Electrochemical Principle
Advantages: Small size, zero power consumption, high sensitivity, good stability, excellent linearity, repeatable performance, fast response speed, general resolution up to 1 ppm, and long service life.
Disadvantages: Significant differences in price, performance, manufacturing process, anti-interference capability, and temperature-humidity resistance among different brands.
NDIR (Non-Dispersive Infrared) Principle
Advantages: Wide measurement range, high accuracy, good selectivity, high reliability, no adsorption effect, no poisoning risk, no dependence on oxygen, less susceptible to environmental interference, and long service life.
Disadvantages: High price, relatively difficult maintenance, large size not suitable for portable instruments; low-concentration detection accuracy needs to be improved; not suitable for long-term power supply operation.
Different types of sensors have distinct market applications based on their working principles. For example, in the field of hazard detection in explosive environments, catalytic combustion-based carbon monoxide sensors play a dominant role. Whereas in portable flue gas analyzers, electrochemical carbon monoxide sensors take the leading position.
In addition to traditional applications, carbon monoxide sensors are also used to meet emerging demands, such as smart homes and fire safety in crowded public places. In these scenarios, carbon monoxide sensors have become one of the core components of intelligent security systems. After uploading data to the platform, the system can not only issue prompts and sound-light alarms but also trigger fresh air systems, ventilation facilities, and even window opening and closing devices through a new-type linkage system to achieve rapid air exchange, thus forming a truly intelligent security system.
Moreover, medical institutions have creatively applied carbon monoxide sensors in smoking cessation programs. Doctors ask smokers to blow into a carbon monoxide concentration detector; the instrument then analyzes the smoker’s smoking intensity and nicotine dependence level. It also scores the smoker’s smoking status based on the detected data, thereby assessing the impact of smoking on the tested individual.
With the continuous evolution of gas sensor technology, new applications and demands will inevitably keep emerging. This will drive the steady development of the gas sensor industry, bring users a more environmentally friendly,
safe, healthy, convenient, innovative and valuable user experience, and ultimately benefit the general public.
